330 C. F. LASERON. 
haven River near Grassy Gully (EK on map), and with it 
some peculiar structures which only seem attributable to 
worm burrows. These cross the stratification at all angles, 
are circular in section and about one-quarter of an inch in 
diameter. At Grassy Gully it was noted that while Diel- 
asma and Productus were common in a perfect state with 
both valves joined, yet the Spirifers and Martiniopsis 
usually consisted of one valve only, and were frequently 
fragmentary. Further to the east, where the Devonian 
rhyolites first outcrop on the Shoalhaven, they rise very 
quickly and the sandstones abut against them rather than 
overlie them. ‘Thus it is evident there was a sudden 
deepening of the old sea at this spot. 
(c) Mudstones at Burrier.—The sandstones of Grassy 
sully as they extend eastwards insensibly pass into a series 
of a much finer texture which containa different fossil fauna. 
They are well exposed in the neighbourhood of Burrier and 
outcrop on the banks of the river from there to Longreach, 
where they disappear beneath beds of a later age. They 
consist largely of micaceous shales intercalated with beds 
of a fine grained grey or red sandstone. The latter is very 
hard and tough and in parts tuffaceous. A high cliff just 
above Burrier shows a splendid section of these beds, and 
in the centre is a small fault with a displacement of a 
couple of feet. All these beds dip a little to the north of 
east; the angle is very uniform and varies between 24° and 
25°. Fragmentary pieces of fossil wood are common in the 
shales, and evidently have drifted into their present position. 
Impressions of a doubtful nature are very common, and are 
I think referable to worm-tracks. One noticed was over 
one foot long, lying upon the bedding plane in the shape 
of a horse shoe. In diameter, it was about an inch, but of 
no great thickness. 
Burrier proved to be a magnificent collecting ground for 
fossils. In the hard sandstone they were admirably pre- 
